184 results about "Adaptive coding" patented technology

The present invention relates to transmission and reception of digital broadcast in a digital broadcast network supporting a configuration of multiple physical layer pipes (PLPs). In particular, signalling parameters relating to a complete PLP are transmitted within layer 1 signalling related to the PLP. The baseband frames mapped on the pipe are configured according to this layer 1 signalling in the same way at the transmitter as they are demapped on the receiver side. The baseband frames are transmitted and received without including these parameters, in particular, at least one of parameters indicating (i) an input stream format, (ii) a single or a multiple input stream, (iii) constant or adaptive coding and modulation, (iv) presence of input stream synchronization, (v) presence of null packet deletion, or (vi) input stream identifier.

The present invention provides a unique feedback system in a wireless communication system wherein the transmission channel is always overloaded with data, which is configured and modulated at a select order of modulation. Based on the channel conditions, only a portion of the data can be successfully received. As such, the receiver will attempt to receive the data using demodulation techniques corresponding to the different levels of modulation used to encode the data transmitted. The receiver will determine the data that is recovered, or the highest order of modulation at which the data is recovered, and provide feedback to the transmitter. The transmitter will then retransmit the data that was not properly received. By overloading the channel at all times, the maximum amount of data capable of being transmitted over the channel is optimized without requiring or heavily relying on the receiver feeding back channel condition information to the transmitter.

Methods and devices for a media processing is provided. In one respect, the methods can provide initiating a bandwidth throttle or a frame rate throttle when resources of a network exceed resources of client device. The methods of the present disclosure may also provide techniques for handling lost packets during transmission using wavelet coefficients.

A method and apparatus for adaptive inter prediction mode coding are disclosed. In the current HEVC, a fixed set of variable length codes is used for the underlying video data, which may not optimally match the statistics of underlying video data. Consequently, the compression efficiency associated with the fixed set of variable length codes will be compromised. Accordingly, an adaptive coding scheme for inter prediction modes is disclosed. The variable length codes used for each inter prediction mode in each coding unit depth is adaptively determined by its respective statistics. The statistics can be measured as the frequency of occurrence of each mode. In one embodiment according to the present invention, counters are used to collect the statistics. According to one embodiment of the present invention, the statistics of inter prediction modes are collected from the previous slice and the set of variable length codes is determined for the subsequent slice (immediately following the previous slice) accordingly. According to another embodiment of the present invention, the statistics of inter prediction modes are updated for each coding unit and the variable length code for each mode is adjusted according to the statistics change during the coding process. According to another embodiment of the present invention, the variable length code for each mode is reset in the beginning of each slice. The reset code word table is either a predefined code word table for whole sequence or a code word table determined by the previous slice.

In a communication where a retransmission is attained based on a Hybrid-ARQ (Automatic repeat ReQuest) system, retransmission having no gain is reduced, and improvement of the transmission efficiency is intended. A mode determining unit 111 of a base station carries out calculation to obtain a received signal quality difference information indicative of a difference between a received signal quality at the current stage and that of a past stage at a terminal, and supplies to a control unit 112. The control unit 112 controls a power setting unit 113 based on the received signal quality difference information supplied from the mode determining unit 111, and thus a transmission power of a signal transmitted from an adaptive coding and modulation unit 13 can be controlled. The present invention can be applied to a base station of a portable telephone communication network, for example.

A process is described to build physical layer frames with a modcode adapted to the signal quality of a destination terminal. Data packets assigned to the same modcode may be sent in the same frame, although packets associated with higher modcodes may be used to complete a frame before switching to the applicable higher modcode for construction of subsequent frames. After an interval, the order of progression is restarted with an out of order packet above a threshold age. Flow control filtering mechanisms and a variable reliability margin may be used to adapt dynamically to the current data traffic conditions.

The embodiment of the invention discloses a video processing method and device. One specific embodiment of the method comprises steps: a to-be-processed video is acquired, and the video is divided toat least one video clip according to a scene; as for the video clip in the at least one video clip, the features of the video clip are extracted; the features and a target video quality are inputted to a pre-trained coding parameter prediction model to obtain the coding parameter of the video clip, wherein the coding parameter prediction model is used for characterizing the corresponding relationship between the features of the video clip and the coding parameter under the target video quality; and according to the coding parameter corresponding to the video clip in the at least one video clip, the video is subjected to coding processing, and a video after coding is generated. The implementation mode realizes adaptive coding based on the scene content, the compression rate can be improved,and the video quality is enhanced.

A video quality adaptive coding artifact reduction system has a video quality analyzer, an artifact reducer, and a filter strength controller. The video quality analyzer employs input video quality analysis to control artifact reduction. The video quality analyzer accesses the video quality of the decoded video sequence to estimate the input video quality. The filter strength controller globally controls the filter strength of the artifact reducer based on the video quality estimate by the video quality analyzer. For low quality input video, the filter strength controller increases the artifact reduction filter strength to more efficiently reduce the artifact. For high quality input video, the filter strength controller decreases the artifact reduction filter strength to avoid blurring image detail.

A Second Generation Digital Video Broadcasting via Satellite (DVB-S2) system is provided. More particularly, a method and apparatus for maintaining synchronization of a signal by changing an Adaptive Coding and Modulation (ACM) method that is used for a conventional DVB-S2 system are provided. In the apparatus and method, an FEC frame of a variable length is formed by turbo encoding rather than Bose-Chaudhuri-Hocquenghem (BCH) and Low Density Parity Check (LDPC) encoding, and a Physical Layer (PL) frame of a specific length is formed regardless of a modulation method, so that a satellite terminal receives a signal transmitted at a specific length regardless of a modulation method or a coding rate to easily maintain synchronization without interruption and efficiently transmit the signal.

A method for determining coding unit (CU) partitioning of a largest coding unit (LCU) of a picture is provided that includes computing a first statistical measure and a second statistical measure for the LCU, selecting the LCU as the CU partitioning when the first statistical measure does not exceed a first threshold and the second statistical measure does not exceed a second threshold, and selecting CUs in one or more lower layers of a CU hierarchy of the LCU to form the CU partitioning when the first statistical measure exceeds the first threshold and/or the second statistical measure exceeds the second threshold.

Bits are stored by attempting to set parameter value(s) of (a) cell(s) to represent some of the bits. In accordance with the attempt, an adaptive mapping of the bits to value ranges is provided and the value(s) is/are adjusted accordingly as needed. Or, to store (a) bit(s) in (a) cell(s), a default mapping of the bit(s) to a predetermined set of value ranges is provided and an attempt is made to set the cell value(s) accordingly. If, for one of the cells, the attempt sets the value such that the desired range is inaccessible, an adaptive mapping is provided such that the desired range is accessible. Or, to store (a) bit(s) in (a) cell(s), several mappings of the bit(s) to a predetermined set of ranges is provided. Responsive to an attempt to set the cell value(s) according to one of the mappings, the mapping to actually use is selected.

An adaptive coding and modulation (ACM) apparatus and method for a forward link in satellite communication is provided. The ACM apparatus may include a receiving unit to receive a signal-to-noise ratio (SNR) of a received signal, a determination unit to determine whether the SNR of the received signal is less than or equal to a threshold value, and a processing unit to execute a channel prediction algorithm when the SNR of the received signal is determined to be less than or equal to the threshold value.

The utility model discloses a regulation method used for modulating the codes and a adaptive coding modulator approach, which comprise the steps as follows: according to the handing capacity and the signal-to-noise ratio curve, the initial value of the encoding conditions can be ascertained; as per signal-to-noise ratio, the degree of encoding can be adjusted; the adjusted encoding degree can be used to adjust the initial value of the encoding conditions, so as to obtain the encoding status. Recording the channel enveloping variation and the variance ratio thereof as the signal-to-noise ratio leaps over the limits of the setting time; also, the channel enveloping variation and the variance ratio thereof can be handled via the fuzzy algorithm, so as to obtain the second trim. The signal-to-noise ratio-based trim can be used to adjust the encoding status to improve the control precision of the transmission mode. The fuzzy algorithm can be adopted to track the channel characteristics of the existing occasion quickly and accurately and forecast the channel variation of the next occasion, so as to further improve the control precision of the transmission mode. Thus, more handing capacity can be obtained to enhance the transmission rate of the system.

The method containing a pre-analysis phase with pel-recursive type motion estimation and an actual coding phase with block matching motion estimation for picture blocks constituted by one or more sub-blocks, wherein the coding phase also comprises a motion vector selection stage for the picture sub-blocks based on the motion vectors calculated by matching for the block containing the sub-block and based on the motion vectors calculated by the pel-recursive type estimation for the pixels or the pixel groups belonging to the sub-block, and a calculation stage of the best partition of a picture block into sub-blocks based on the correlation calculations taking into account the motion vectors selected from the sub-blocks constituting a block.

The invention discloses an uplink adaptive modulation and coding method and a base station implementing the method, wherein the method includes: the base station locally configures the corresponding relationship between uplink Signal to Interference-plus-Noise Ratio (SINR) and uplink Modulation and Coding Scheme (MCS), measures uplink SINR to obtain the uplink SINR measurement value, performs filtering and smoothing processing on the SINR measurement value and history SINR filtering values to obtain uplink SINR smoothing filtered value, and determines the MCS adopted by the uplink based on the uplink SINR smoothing filtered value and the corresponding relationship. Through the invention, the dependence on the corresponding relationship between the uplink SINR and the MCS is reduced, and the current channel conditions can be reflected more in real, responses can be made quickly and stability and reliability of the system can be effectively guaranteed.